проці-

Belarusian

From проці (próci, “against”). Compare Russian противо- (protivo-), Ukrainian проти- (proty-), Polish przeciw-, Czech proti-.

проці- • (próci-)

anti- (designed to fight against something)
‎проці- (próci-) + ‎маляры́йны (maljarýjny, “malarial; (relational) malaria”) → ‎процімаляры́йны (procimaljarýjny, “anti-malarial”)

‎проці- (próci-) + ‎та́нкавы (tánkavy, “(relational) tank”) → ‎проціта́нкавы (procitánkavy, “antitank”)
anti- (hostile to someone or something)
‎проці- (próci-) + ‎наро́дны (naródny, “national; (relational) people”) → ‎процінаро́дны (procinaródny, “antinational, antipopular”)

‎проці- (próci-) + ‎ура́давы (urádavy, “government”) → ‎проціўра́давы (prociŭrádavy, “anti-government”)
anti- (opposed to, goes against the principles of someone or something)
‎проці- (próci-) + ‎зако́нны (zakónny, “law (relational)”) → ‎процізако́нны (procizakónny, “anti-law; illegal”)
counter-
‎проці- (próci-) + ‎ціск (cisk, “pressure”) → ‎проціці́ск (procicísk, “counter-pressure”)

In compound words, the prefix is not stressed, but the pronunciation of [o] is retained.
Words such as праціўнік (praciŭnik, “opponent, enemy”) are not considered as prefixed by this; they are almost always inherited from Proto-Slavic.
проціў- (próciŭ-) on the other hand is constructed using проці- (próci-) before a word that starts with у- (u-), like проціўра́давы (prociŭrádavy) above.
There are yet some words that begin with проціва- (próciva-), such as процівага́з (procivaház); they are likely simply borrowings from Russian (compare противо- (protivo-), противога́з (protivogáz)), possibly with blending or contamination from проці- (próci-), as *проціва- (*próciva-) is not a productive suffix in Belarusian.

“проці...”, in Skarnik's Belarusian dictionary (in Belarusian), based on Kandrat Krapiva's Explanatory Dictionary of the Belarusian Language (1977-1984)